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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a104eced7ae9302aafe6d3f2535ee115fe6a02bc5dd5a5208cc99ac6bc082331' 
  AND token = 'bgRPp634nb/aYMpt6AUjH/n3u5gSoqMcLpgUviGAr40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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