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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc5b05a03a1e59aa5f2814baed228d8c4048e009527d0b733288a27097f76f2a' 
  AND token = 'ldcnp1xw925mBA09dj7Hq40pjH14xmYvEuYIfaaIoHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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