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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50c6e76146496472601d2f613dcd80d22454e4045056e8d8dcdeef0aa8247d31' 
  AND token = 'DS2lJFCvtvjo0oYntSX6vVDPHWcH4Esuf4UCZI7dmEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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