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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02bc682f9a10e2b2709fa7328fc2e23db5217613fbefa0e183c943273f171db3' 
  AND token = 'DaW5Uhd7K+hqWkwYbjdrrYu5XVWPapcARrYPCYTxmEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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