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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38418665fb91fcf229583f346a0d9f1e2f96da901c90cf7ba4b4c24c61d26f2e' 
  AND token = 'awD7UuLRSCbg1mzMV0hPJNCh2CWFaXqp3swq/8btesw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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