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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a582fbcf961748ba535367b1b8f522cb083702bb62ff3e17474e1677af839d0c' 
  AND token = 'K1VNhNuTSkFRfH4IFiK8Kp/94x3KUFF/DVh2hfo52Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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