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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199f4aeae4c31e930f4701edfe85050e941d120ab105a77b2ecce583b2134e91' 
  AND token = 'WdqZZvqyPnyI1M7oUm7tzSoTG8Df/VUlARj7VyqL96E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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