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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38feb83e3f9ca45e870c5f1f67f2d085a2b00c7a8f49aef8c05bb4ca59dab455' 
  AND token = 'C/wmyle/yRH1aCS7nztzEfy/kXG+X8fRXZgIp+qvRj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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