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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee81417cd2c193fe059b94a68a69107392aa06e13a3acb4e408c5e43a731e19' 
  AND token = 'EztIzak4/cX9j1sl/ZA70BDiwXJJgMwzMlTQR7Ca3Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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