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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76cd3086f38bab46f263c9f745f33848fbb35bdced8684d9b8ed21bf8300c1f4' 
  AND token = '/1LPoQoerYAVfo/aLC7z9ETEFtrXGISoA0ApfupWRXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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