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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1101b5f376c82651d591dc8d7ca5280f11575fe89a616ddafc4aafdd5c85484' 
  AND token = 'M2iF7A6Hix2/ZWBFRuFdJaNqO93mvuFr5hL4S6d64aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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