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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dde8b3e61c69bb8771ec02d1fea33c40b19e418f1b0f00e9f63599d59bf499e' 
  AND token = 'ASZ3WWna3s5ICQX49kPfVmxYkcaB908z+VtYqkVkDeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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