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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e06afcec71191d345fa755d47747175f3b2df8389d27729603fb1476110c5873' 
  AND token = 'iPtajGzvRY+AtSkr6RTrcSDkG8P6pnW6ppq5MNQ46B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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