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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69401497828ff1ede858a500fb33d294a251f6d51d7ed3486cfff1e6c3647fd4' 
  AND token = '1/mC+ndGObmVPmZ65jbsV1qoaHD0q9a4rmCsqJjerck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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