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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd14fc25f13c8b663f563aa3329bf9088688976b6fa79d05d43b447c9935c7536' 
  AND token = 'cIe23T0cwT0cLQ9Rek0ivEXWy+yZN+ckupXph9pFBBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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