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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3bd068e310c1d976bc4841a01a40f8753a5725d679531c0a32ab6a858a6f1c9' 
  AND token = 'uuI7BhxnmI396umisKn41qRKf+cMBWGunx8qwPQQEKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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