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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d9881b6f873b20d0a9b5df82a3c8fa168bd96659e29ac754a7e235b3f80edb1' 
  AND token = 'K92/brwXLFnljt9dgDOukQo86NLD1Y22/S2cp5PjC3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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