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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9661e4ed6cc0f320e4b48eba27aecc89742c87620a58d009e6f29fe7d3d5777e' 
  AND token = 'pcla5IdE95GFf0gzCvfoRJquVSv50JlNSEQZNY7pzJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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