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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1262559e2cd4b9a242364585b7db00df6c2192e662e763665fdae9e1ad2740c2' 
  AND token = '4VUxJjRHRzqMoQ6hKF+283P3DAYwa35xM9uWNXVoolg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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