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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '915405fcace788e1d871f4dd05a8d492fc3a4b4e8bad2f089bc7ad6cf4a265b5' 
  AND token = '9XK/KwI6fJAFvZJqr6DKIIQ0Z2e0f2kuf8uF1n8VfC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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