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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e2315eaff0f60bb79a2b8a1fcc0c4384cac0a346f44445d7a7f055b55ed664' 
  AND token = 'jC5pkRR7v8iadpeDHtcx8LivY2dF84DyD2KQzPouxDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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