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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb9c9b39e81537307c8b4d1719557bfb29030bc622633bc974ef108b416492e' 
  AND token = 'FL7gL0tc4w6q1rxbdnOe/prstCNGdtfAd6btzt8HaoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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