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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd25a94ecae97d83c03885eb16510d0b9359f47d1ba8d3462a429a9640f83cff3' 
  AND token = 'meUIJ5l7L3739p53xH1i9LQht3nPCxUE/ZVyZo296hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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