SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b65f807d438e1601d98b7db3770aff48100a94366893b2a1bca3713ddaeb21' 
  AND token = 'zAhdYfWf3lS/TJ2QBFxG8XcsZNRO+wdHMAuhMhnuPV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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