SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d5ebb4cebc6cf8d1a4e451919761a8d78f368efa56ce9df3400934159494642' 
  AND token = 'UYS6vw9JkZCGLvFsr1KkgnNgo0LWCAIGuiLXFZQYEaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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