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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b7b4fc4dc45e9e913e26f7dd9b5dc6bf149716a84a9606f754e1da6d5aa8802' 
  AND token = '38tCchTUxAbGs2dmfO+mA8gZCuCKEH4PoDHz1wLC3f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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