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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828f92482e2702c4bc6c61aaef5406944f9e4f22a71e1d8061d42cd22f1abd3a' 
  AND token = 'NuPq9nsM4q5KQvvBp9LKUArRgMeDaO4F6IQldWGRxYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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