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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dbd429149e6681fb657424d99bd938654a21059e5c8565165a8fdab65ba147d' 
  AND token = '/FkG1wFbfgOF2w/XCwf5W+SuE76BRfIsvtbqgJEvXig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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