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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '218831e8ca496b84a6d8c714acf6597a76c4f6f06404e3c72561517f429a5dc5' 
  AND token = 'liGaEfgwcHejSI04ay6+ioxmXu3CFMUGKSY8DGXkieo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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