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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a35ccce58e07101d2299b204879f89fa688fe42b72ca0d9974ef953f925afe47' 
  AND token = 'fHqH0bKRI1RI7/yjNOGqHHaLECOZE/YB2X0dqVzyeOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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