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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a871a225af7551779f993c890a75e72cfb62f8f3d5a0039169ee4fdcda2e7a3' 
  AND token = '6qhqMqr31DToduoz/PFeLztjbkX9xiPVy7/ly5FmVRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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