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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e6bab6199b3b741d4f77267c13f562409c9b3f0ac0025528bf087cfdcbf6db' 
  AND token = 'myzEVA2RakIuSKQ0GQQuAlBJiAE6igd5pARJyoKzD/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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