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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd50bf1bf6af40599f1c971ccb2bcc99bec7fe72c79474b98067eb318d249b84a' 
  AND token = '/rROk+qsQIlBZXyMAsl27KvKG0xWofgfx+3rSGT6qMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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