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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae8085c726a1610871c4cf49efbf3ae2e2b97be44f82beed93c02ad224ccf5dd' 
  AND token = 'lt5bWMVm8puFM5NmjoA2QEd4s1SQGWKeN405Y2YzzDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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