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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f6cf6d393131d8abb5ac0bad2499262c8fc48b683ed1a60ba513518425097eb' 
  AND token = 'eDvs5ubgsuPvvIewKRae9AcRdzI2v/nQ6XLIw9JoYhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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