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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '657ee109e6531009ecd64cb9b3867d8810f255b584b8ac267f73c71fdb4b538c' 
  AND token = 'ZorwXGQowk5TrfeJIb/RUJxnQ7gtZdXmNE9axbNXS+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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