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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '272bf96f18a44fad7ddc4aecc46bca1c8cdb88e9899ac84cdcdd3627a41dd961' 
  AND token = 'Er8aKtHzvQHVXz23Cp5gk4phMc0RncaADWL+jVtrHmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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