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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db86c4b237bf2c469edb721aeb35ef8fd2608f994cd6f2720329dff7e0d15cb2' 
  AND token = 'e/Zwj87wlExfJWbbLDvohaTjMwC1blQdM2pKI23BkuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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