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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e436555ea5c991cd46caea1a52afadf44967f5e77a11efb6a9243cea6cfc43f7' 
  AND token = 'B94hn/ALYbjk4CAuDgKxIJQ9rL9kqlGkCu5p4b+22QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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