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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e63c5f0d20950eaff7b4986c383e24d0d3165b15bf6d996e0077be5dda0271' 
  AND token = 'QyiPrkr0pW7VJPJUufPwbIt0zUv8LLy1lieICFoNdgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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