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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a68766ac7c0b3370a499dab0479a466452e35869893ecdc25943e11bf26ccf' 
  AND token = 'HyInOGMYknIm/Sotkaa0rUDZit8Q1+79JjA6DHnAQw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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