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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e696944ca538ec5ee41a932a25231e4ab98adb6329e4851e029b1af297d003' 
  AND token = 'aPPsaL6iwFVt+5HC7eX0xCswEgw4HkuvDJKSxsB+u7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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