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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f418fecaafee8bcb80482737f208a398fa8b40f540621d140d13ce0cc74420a6' 
  AND token = 'S59c6nTAMy+t/+FV3nUBUzS0hmnW4Qe5/kH6TqOupc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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