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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd1b6aed316fbdd9a8b1312a24af444800e4832485a8e03e9af8d51613bcc559' 
  AND token = 'jHiFUFRa2FM/3168zdXkjvXGynIeYirPuHXRrCazXEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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