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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccae8ffbe699791ca6ef6f57b5a25b7559a6e50592d222e127a8f3b07f8d7562' 
  AND token = '9kCPR2yfuEVmJrXF7OPnrKa0d6qd1R9vzOJ7/oeHzrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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