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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61236bd729b0094119b5b7397d50f60772dbefce0a33b56fb0c30e9ccbfc099c' 
  AND token = 't7mSgWUeA1c5srtAqWVEXzZe7qyFjnaKgyCA2zOiR+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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