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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc809aa8ca1b3b563e6ee14c8e0b22278833cdcc142f31d686041e048f0e3e74' 
  AND token = 'ChiGVhTpGTx2uRHbEwBIemUk2wnvFw8qUYaBts7EO0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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