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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc30d7cccd7f0efd0af264f5b0cef13f6ddcf864ceca23c43a760913ea9e06e0' 
  AND token = '8/0etJ0Ewm861bFTIb3yq/9mU7SwOTddcoUFcDrMjeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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