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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b4cf88fb3078f8b7089c3c81b72f82a64423dad79ba638df933361759621747' 
  AND token = '6WA0DJm98KYdC3kX61wX7VDu6wx9ovgDzwDRSabNTME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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