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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90148088e4f1845a316016d7bb55426afe9660cfe0712df8c1b84d1d914058cc' 
  AND token = 'scuRZtD8MMip80VaRNvAd0Rb7XtYW0GvCQ5VlQ6zbs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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