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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fd6370b62de2179a8c6f108abc0fc8f1b151242382cc920beaa33c35b0ab54c' 
  AND token = 'nCFqbRo7g310mgJUpO8uSpviT/gSYhybsR8w6a2rDpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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