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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69084530332b70ee0421f39a65f581cd9cd8e1e0c4ee9a74a46e3d91be282660' 
  AND token = '0UaeouuV7p//NAsdX8TdfHdFrg4MmGOHO99e1AqTXUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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