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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8315bb470cf440901cd7c15300b6ef4ce1b1d5fef402688cf91d5a55ffa51b87' 
  AND token = '1AljytYhUuYy7TUQGgS1Ux5dIiBiaDigu/4LTDsNoeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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