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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3631c1b9278b2750b258759b7953af55b33ef25dedba44cedce1f4ccec51ab7e' 
  AND token = 'zQtNMoytkTIUJDHDuEUBUalia6ne5HZtbviAwhy1N8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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