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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e8b4d150861ce783f904f031b0f28ceaa7cda3b8546a9779879b944d2b68ec' 
  AND token = 'G0wL1r1VdZ/Okr2IMeVTocGSSwi7Se4H6WrUO1kdoCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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