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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdb57eec92d88cddf9f6f095962a4c689be77d3c6c711c1ffb3998fb9edae61f' 
  AND token = '6JHOC43gZpo3j5qMYgP+QkySDopFk1yB3dqm7LLNXTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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