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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2020af87f2cfc5d6ad2dbd0accc0d91d292d0a57b5dba9fdf973473f4221d283' 
  AND token = '0UkVeCDatGJ1eGe2RVVLms40kRuH3eerv/pNQviqulM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}