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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9036f0d91ba22d45c24ec85eb478b7e4d370b4dff8cafc77650e2a87cb05249f' 
  AND token = 'ZHIcb71ihiM76O+gYRgcnrCKvFCr8x9KNiV2i0bXCYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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