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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f55bcb60b07ef5758a75b40ec63e2f139b8721f498062e01a23e74426862b349' 
  AND token = 'vAnRimKEMXiWBGBbTNyhWO1D10SYZ92hkNjITwpuy0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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