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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47498eb6a2f87d5ca410062f28e688e335875c0f9c5524861d894fd06c0437d2' 
  AND token = 'ggFZJ0V/5+iVbB+JE39L47JndPHQn9UMdmR1MapmZ2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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