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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0125e2d49514d4b2074b3804c64326c4c279b8d164d52670c6759619668447fb' 
  AND token = 'q+9PbSxUxbMehiMve53o4IVqEVx0Su3P6rUTafoY1UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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