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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18e3388a2cc99559ee9bce43a9d2a6d51c706558bdce6856b9b863acf01a2ee3' 
  AND token = '1H6smH39TVYyvG4IW3Xi5vMtNYMfj6nViKX7n5A3kgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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