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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bcb628962d71666a1e84ea48141764cfa186a4bd928b6e784ee3cd51e5e5ec7' 
  AND token = 'S3W2aVbIyVqHXhClTx0Im9iY6WQvizarXENIRtnQTGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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