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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0159039d1ee2e28b4707c3aa7cff430856a8a4d298f36e513a2956ed9191045c' 
  AND token = 'KeLfFmgRAL6D5Tk8zHJwX6OYxJTX0O0iW/yn/TsbC3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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