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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b09ff0d834c5a35b5dc4710f15456686ead9b505bf0470a331250c98fb29b4' 
  AND token = '51OcDhy7MlDiWtbdWgCkH3mBNlNZGg8vRMGQaF0oZ+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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