SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5840af2a3fe1095e5908dab4fde912a93f422c34ec9b0f294d8d3a8fd8ec4f77' 
  AND token = 'ZhEnT/y3M/6F7+hfVgEZHGs1kEDKI8VDXjxwYrs960U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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