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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29288b28d1ae24a7291dd207f7b1588f2aa8d4f37772a8c969492bbf609d629' 
  AND token = '8M/AgIaB4Pyn3iv92WD0TfLhTMH8GZYBpvvwd+CJdJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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