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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87039062958d77bc3eb9cb83a8601449792338cb393b8d2690732b4f10136b2e' 
  AND token = 'H8OC0FURXqLk8kQDstmzG65mBGDzMvaFOrdt409u12s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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