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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f8dfd79b0cfb59d6942abd5071043227786df87352c03edb0e1544e68c7b5d' 
  AND token = 'TmO3htc57D3GjFIvBGGs0qOM0PGcMe5wP67VnnYps00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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